Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0fcb1600302844…

MALICIOUS

PDF

76.0 KB Created: 2021-09-08 15:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31ec739cdbd50b8fc4d0ea13e25016fd SHA-1: ca2a12b4f87876990e61dd282f4dc08aa2d705da SHA-256: 2d0fcb1600302844634ee228d1de5b24145a28c45af043ffd9b24f616ec18d96
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, pointing to numerous external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=disaster+management+book+class+8+ncert+in+english+pdf PDF link annotation
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/74443536671.pdfIn PDF document text
    • https://durimawar.com/contents/files/592423762.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/166597668.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/jafilegax.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/62919081765.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/sufumimatow.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/12621721555.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/zamaliwafurov.pdfIn PDF document text
    • http://grabnerestriche.at/luwifo.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/62735072774.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/gevirifafuwesudupuj.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/katerub.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/59873972473.pdfIn PDF document text
    • http://redactron.com/userfiles/file/69347513498.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/gasitewiz.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/94499551892.pdfIn PDF document text
    • https://hssanesteban.cl/files/88750499682.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613805ba6e538---mitujog.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/gedoxoxemunaxeperokaf.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/69187661500.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/61078552356.pdfIn PDF document text
    • https://frisch.ro/files/file/bapuwonakewu.pdfIn PDF document text
    • http://njxinbell.com/upload/files/11712262502.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC51 11508 bytes
SHA-256: eb50dc96e91956203786e2f1134cfcd585c4e9f109067d88b5de384bce34a372
font_01_sfnt_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 19444 bytes
SHA-256: 12b9db82a8f6096f3680d1e0a9f65a32a96e73e56e03513ef84bb08cd5c04c96
font_02_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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